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   源码介绍

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package com.tokudu.demo;

import java.io.IOException;

import android.app.AlarmManager;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.util.Log;

import com.ibm.mqtt.IMqttClient;
import com.ibm.mqtt.MqttClient;
import com.ibm.mqtt.MqttException;
import com.ibm.mqtt.MqttPersistence;
import com.ibm.mqtt.MqttPersistenceException;
import com.ibm.mqtt.MqttSimpleCallback;

public class ConnectServerTask extends AsyncTask<Object, Void, Object> {

	// this is the log tag
	public static final String TAG = "DemoPushService";
	// This is the instance of an MQTT connection.
	public MQTTConnection mConnection;
	// the IP address, where your MQTT broker is running.
	// private static final String MQTT_HOST = "192.168.1.71";
	private static final String MQTT_HOST = "192.168.1.18";
	// private static final String MQTT_HOST = "192.168.1.190";
	// the port at which the broker is running.
	private static int MQTT_BROKER_PORT_NUM = 1883;
	// Let's not use the MQTT persistence.
	private static MqttPersistence MQTT_PERSISTENCE = null;
	// We don't need to remember any state between the connections, so we use a
	// clean start.
	private static boolean MQTT_CLEAN_START = true;
	// Let's set the internal keep alive for MQTT to 15 mins. I haven't tested
	// this value much. It could probably be increased.
	private static short MQTT_KEEP_ALIVE = 60 * 15;
	// Set quality of services to 0 (at most once delivery), since we don't want
	// push notifications
	// arrive more than once. However, this means that some messages might get
	// lost (delivery is not guaranteed)
	private static int[] MQTT_QUALITIES_OF_SERVICE = { 0 };
	private static int MQTT_QUALITY_OF_SERVICE = 0;
	// The broker should not retain any messages.
	private static boolean MQTT_RETAINED_PUBLISH = false;

	// MQTT client ID, which is given the broker. In this example, I also use
	// this for the topic header.
	// You can use this to run push notifications for multiple apps with one
	// MQTT broker.
	public static String MQTT_CLIENT_ID = "tokudu";

	// These are the actions for the service (name are descriptive enough)
	private static final String ACTION_START = MQTT_CLIENT_ID   ".START";
	private static final String ACTION_STOP = MQTT_CLIENT_ID   ".STOP";
	private static final String ACTION_KEEPALIVE = MQTT_CLIENT_ID
			  ".KEEP_ALIVE";
	private static final String ACTION_RECONNECT = MQTT_CLIENT_ID
			  ".RECONNECT";

	// Connection log for the push service. Good for debugging.
	private ConnectionLog mLog;

	// Connectivity manager to determining, when the phone loses connection
	private ConnectivityManager mConnMan;
	// Notification manager to displaying arrived push notifications
	private NotificationManager mNotifMan;

	// Whether or not the service has been started.
	private boolean mStarted;

	// This the application level keep-alive interval, that is used by the
	// AlarmManager
	// to keep the connection active, even when the device goes to sleep.
	private static final long KEEP_ALIVE_INTERVAL = 1000 * 60 * 28;

	// Retry intervals, when the connection is lost.
	private static final long INITIAL_RETRY_INTERVAL = 1000 * 10;
	private static final long MAXIMUM_RETRY_INTERVAL = 1000 * 60 * 30;

	// Preferences instance
	private SharedPreferences mPrefs;
	// We store in the preferences, whether or not the service has been started
	public static final String PREF_STARTED = "isStarted";
	// We also store the deviceID (target)
	public static final String PREF_DEVICE_ID = "deviceID";
	// We store the last retry interval
	public static final String PREF_RETRY = "retryInterval";

	// Notification title
	public static String NOTIF_TITLE = "Tokudu";
	// Notification id
	private static int NOTIF_CONNECTED = 0;

	private long mStartTime;

	public interface ConnectionCallBack {
		/** 处理接收到的信息 */
		public void handleMsg(String msg);
	}

	private ConnectionCallBack callBack;

	private Context context;

	public ConnectServerTask(Context context, ConnectionCallBack callBack) {
		mStartTime = System.currentTimeMillis();
		this.context = context;
		this.callBack = callBack;
		mPrefs = context.getSharedPreferences(TAG, Context.MODE_PRIVATE);
	}

	public void setCallBack(ConnectionCallBack callBack) {
		this.callBack = callBack;
	}

	@Override
	protected Object doInBackground(Object... params) {
		start();
		return null;
	}

	@Override
	protected void onPreExecute() {
		super.onPreExecute();
	}

	@Override
	protected void onPostExecute(Object result) {
		super.onPostExecute(result);
	}

	private void log(String message, Throwable e) {
		if (e != null) {
			Log.e(TAG, message, e);

		} else {
			Log.i(TAG, message);
		}

		if (mLog != null) {
			try {
				mLog.println(message);
			} catch (IOException ex) {
			}
		}
	}

	// Sets whether or not the services has been started in the preferences.
	private void setStarted(boolean started) {
		mPrefs.edit().putBoolean(PREF_STARTED, started).commit();
		mStarted = started;
	}

	// We schedule a reconnect based on the starttime of the service
	public void scheduleReconnect(long startTime) {
		// the last keep-alive interval
		long interval = mPrefs.getLong(PREF_RETRY, INITIAL_RETRY_INTERVAL);

		// Calculate the elapsed time since the start
		long now = System.currentTimeMillis();
		long elapsed = now - startTime;

		// Set an appropriate interval based on the elapsed time since start
		if (elapsed < interval) {
			interval = Math.min(interval * 4, MAXIMUM_RETRY_INTERVAL);
		} else {
			interval = INITIAL_RETRY_INTERVAL;
		}

		log("Rescheduling connection in "   interval   "ms.");

		// Save the new internval
		mPrefs.edit().putLong(PREF_RETRY, interval).commit();

		// Schedule a reconnect using the alarm manager.
		Intent i = new Intent();
		i.setClass(context, PushService2.class);
		i.setAction(ACTION_RECONNECT);
		PendingIntent pi = PendingIntent.getService(context, 0, i, 0);
		AlarmManager alarmMgr = (AlarmManager) context
				.getSystemService(Context.ALARM_SERVICE);
		alarmMgr.set(AlarmManager.RTC_WAKEUP, now   interval, pi);
	}

	// log helper function
	private void log(String message) {
		log(message, null);
	}

	// Check if we are online
	private boolean isNetworkAvailable() {
		NetworkInfo info = mConnMan.getActiveNetworkInfo();
		if (info == null) {
			return false;
		}
		return info.isConnected();
	}

	// This inner class is a wrapper on top of MQTT client.
	class MQTTConnection implements MqttSimpleCallback {
		IMqttClient mqttClient = null;
		ConnectionCallBack callBack = null;

		// Creates a new connection given the broker address and initial topic
		public MQTTConnection(String brokerHostName, String initTopic,ConnectionCallBack callBack)
				throws MqttException {
			this.callBack = callBack;
			// Create connection spec
			String mqttConnSpec = "tcp://"   brokerHostName   "@"
					  MQTT_BROKER_PORT_NUM;
			// Create the client and connect
			mqttClient = MqttClient.createMqttClient(mqttConnSpec,
					MQTT_PERSISTENCE);
			String clientID = MQTT_CLIENT_ID   "/"
					  mPrefs.getString(PREF_DEVICE_ID, "");
			mqttClient.connect(clientID, MQTT_CLEAN_START, MQTT_KEEP_ALIVE);

			// register this client app has being able to receive messages
			mqttClient.registerSimpleHandler(this);

			// Subscribe to an initial topic, which is combination of client ID
			// and device ID.
			initTopic = MQTT_CLIENT_ID   "/"   initTopic;
			subscribeToTopic(initTopic);

			log("Connection established to "   brokerHostName   " on topic "
					  initTopic);

			// Save start time
			mStartTime = System.currentTimeMillis();
			// Star the keep-alives
			startKeepAlives();
		}

		// Disconnect
		public void disconnect() {
			try {
				stopKeepAlives();
				mqttClient.disconnect();
			} catch (MqttPersistenceException e) {
				log("MqttException"
						  (e.getMessage() != null ? e.getMessage() : " NULL"),
						e);
			}
		}

		/*
		 * Send a request to the message broker to be sent messages published
		 * with the specified topic name. Wildcards are allowed.
		 */
		private void subscribeToTopic(String topicName) throws MqttException {

			if ((mqttClient == null) || (mqttClient.isConnected() == false)) {
				// quick sanity check - don't try and subscribe if we don't have
				// a connection
				log("Connection error"   "No connection");
			} else {
				String[] topics = { topicName };
				mqttClient.subscribe(topics, MQTT_QUALITIES_OF_SERVICE);
			}
		}

		/*
		 * Sends a message to the message broker, requesting that it be
		 * published to the specified topic.
		 */
		private void publishToTopic(String topicName, String message)
				throws MqttException {
			if ((mqttClient == null) || (mqttClient.isConnected() == false)) {
				// quick sanity check - don't try and publish if we don't have
				// a connection
				log("No connection to public to");
			} else {
				mqttClient.publish(topicName, message.getBytes(),
						MQTT_QUALITY_OF_SERVICE, MQTT_RETAINED_PUBLISH);
			}
		}

		/*
		 * Called if the application loses it's connection to the message
		 * broker.
		 */
		public void connectionLost() throws Exception {
			log("Loss of connection"   "connection downed");
			stopKeepAlives();
			// null itself
			mConnection = null;
			if (isNetworkAvailable() == true) {
				reconnectIfNecessary();
			}
		}

		// Remove all scheduled keep alives
		void stopKeepAlives() {
			Intent i = new Intent();
			i.setClass(context, PushService2.class);
			i.setAction(ACTION_KEEPALIVE);
			PendingIntent pi = PendingIntent.getService(context, 0, i, 0);
			AlarmManager alarmMgr = (AlarmManager) context
					.getSystemService(Context.ALARM_SERVICE);
			alarmMgr.cancel(pi);
		}

		/*
		 * Called when we receive a message from the message broker.
		 */
		public void publishArrived(String topicName, byte[] payload, int qos,
				boolean retained) {
			// Show a notification
			String s = new String(payload);
			//showNotification(s);
			if(callBack!=null){
				callBack.handleMsg(s);
			}
			log("Got message: "   s);
		}

		public void sendKeepAlive() throws MqttException {
			log("Sending keep alive");
			// publish to a keep-alive topic
			publishToTopic(MQTT_CLIENT_ID   "/keepalive",
					mPrefs.getString(PREF_DEVICE_ID, ""));
		}
	}

	// Schedule application level keep-alives using the AlarmManager
	private void startKeepAlives() {
		Intent i = new Intent();
		i.setClass(context, PushService2.class);
		i.setAction(ACTION_KEEPALIVE);
		PendingIntent pi = PendingIntent.getService(context, 0, i, 0);
		AlarmManager alarmMgr = (AlarmManager) context
				.getSystemService(Context.ALARM_SERVICE);
		alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP,
				System.currentTimeMillis()   KEEP_ALIVE_INTERVAL,
				KEEP_ALIVE_INTERVAL, pi);
	}

	public synchronized void reconnectIfNecessary() {
		if (mStarted == true && mConnection == null) {
			log("Reconnecting...");
			connect();
		}
	}

	
	// This receiver listeners for network changes and updates the MQTT
	// connection
	// accordingly
	private BroadcastReceiver mConnectivityChanged = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			// Get network info
			NetworkInfo info = (NetworkInfo) intent
					.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);

			// Is there connectivity?
			boolean hasConnectivity = (info != null && info.isConnected()) ? true
					: false;

			log("Connectivity changed: connected="   hasConnectivity);

			if (hasConnectivity) {
				reconnectIfNecessary();
			} else if (mConnection != null) {
				// if there no connectivity, make sure MQTT connection is
				// destroyed
				mConnection.disconnect();
				cancelReconnect();
				mConnection = null;
			}
		}
	};

	// Remove the scheduled reconnect
	public void cancelReconnect() {
		Intent i = new Intent();
		i.setClass(context, PushService2.class);
		i.setAction(ACTION_RECONNECT);
		PendingIntent pi = PendingIntent.getService(context, 0, i, 0);
		AlarmManager alarmMgr = (AlarmManager) context
				.getSystemService(Context.ALARM_SERVICE);
		alarmMgr.cancel(pi);
	}

	public synchronized void start() {
		log("Starting service...");

		// Do nothing, if the service is already running.
		if (mStarted == true) {
			Log.w(TAG, "Attempt to start connection that is already active");
			return;
		}

		// Establish an MQTT connection
		connect();

		// Register a connectivity listener
		context.registerReceiver(mConnectivityChanged, new IntentFilter(
				ConnectivityManager.CONNECTIVITY_ACTION));
	}

	public synchronized void stop() {
		// Do nothing, if the service is not running.
		if (mStarted == false) {
			Log.w(TAG, "Attempt to stop connection not active.");
			return;
		}

		// Save stopped state in the preferences
		setStarted(false);

		// Remove the connectivity receiver
		context.unregisterReceiver(mConnectivityChanged);
		// Any existing reconnect timers should be removed, since we explicitly
		// stopping the service.
		cancelReconnect();

		// Destroy the MQTT connection if there is one
		if (mConnection != null) {
			mConnection.disconnect();
			mConnection = null;
		}
	}

	public synchronized void keepAlive() {
		try {
			// Send a keep alive, if there is a connection.
			if (mStarted == true && mConnection != null) {
				mConnection.sendKeepAlive();
			}
		} catch (MqttException e) {
			log("MqttException: "
					  (e.getMessage() != null ? e.getMessage() : "NULL"), e);

			mConnection.disconnect();
			mConnection = null;
			cancelReconnect();
		}
	}

	//
	private synchronized void connect() {
		log("Connecting...");
		// fetch the device ID from the preferences.
		String deviceID = mPrefs.getString(PREF_DEVICE_ID, null);
		// Create a new connection only if the device id is not NULL
		if (deviceID == null) {
			log("Device ID not found.");
		} else {
			try {
				mConnection = new MQTTConnection(MQTT_HOST, deviceID,callBack);
			} catch (MqttException e) {
				e.printStackTrace();
				// Schedule a reconnect, if we failed to connect
				log("MqttException: "
						  (e.getMessage() != null ? e.getMessage() : "NULL"));
				if (isNetworkAvailable()) {
					scheduleReconnect(mStartTime);
				}
			}
			setStarted(true);
		}
	}
}